# NTSB MKC84LA190: Piper PA-25-235, N6797Z, Atwood, KS, June 29, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 29, 1984, 07:10 local (12:10 UTC)
- Place: Atwood, KS
- Coordinates: 39.810626, -101.039138 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.8106&lon=-101.0391&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 33723
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC84LA190
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33723/pdf
- Page: https://openairdocs.org/ntsb/MKC84LA190

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(partial) - mech failure/malf, maneuvering - aerial application
  - engine assembly,valve,intake - jammed (cause)
  - engine assembly,push rod - bent (cause)
- Forced landing, descent - emergency
- Nose over, landing - roll
  - terrain condition - soft (contributing factor)

## Analysis

DURING A SWATH RUN, THE ENG BEGAN LOSING POWER. THE PLT PULLED UP & LOOKED FOR A PLACE TO LAND, THEN DUMPED HIS CHEMICAL LOAD. ENG RPM CONTINUED DECREASING SO HE ELECTED TO LAND IN A FIELD THAT WAS BEING SUMMER FALLOWED. DURING THE LANDING, THE ACFT NOSED OVER. AN EXAM OF THE ENG REVEALED THAT THE #4 EXHAUST VALVE HAD BECOME FROZEN SHUT & THE PUSH ROD HAD BENT.

## Aircraft

- Registration: [N6797Z](https://openairdocs.org/deregistered/N6797Z-1994-03-31), registration cancelled 1994-03-31, S/N 252444 (OpenAirDocs)
- Reported make and model: PIPER PA-25-235
- Registry model: [Piper PA-25-235](https://openairdocs.org/model/piper-pa-25-235) (registry code 7102504) (OpenAirDocs)
- Category: Airplane
- Serial number: 25-2444
- Airframe hours: 4484
- Engines: LYCOMING O-540-B2B5 235 horsepower reciprocating
- Damage: Substantial damage
- Fire: On-Ground
- Flight: Aerial application, Part 137
- Registered owner: Anthony C. Schmid
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, January 10, 1984, 141 hours before
- Departed: ADT, ATWOOD, KS

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 29; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 1,298 total, 300 in this make and model, 1,153 as pilot in command, 148 in the last 90 days, 9 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 280° at 5 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 55 °F, dew point 55 °F
- Altimeter: 30.00 inHg
- Observed at: GLD, 25 nm away

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19840629028429A](https://openairdocs.org/incident/19840629028429A), Jun 29, 1984: Piper PA25235, Atwood, KS, Substantial damage. Engine lost power during a spray run. Nosed over on forced landing. Found a stuck exhaust valve.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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